Pom-pom shaped flowers - identification please ?

[atalanta]

This spring I have seen tubs of pom-pom shaped flowers with small tight heads of petals somewhat like small dahlias, only red pink and white. Tallish stem - up to a foot tall - much like the stem of a dandelion. Obviously far too early for chrysanthemums. Much tighter-petalled than alliums. Each flower-head about the size of a ping-pong ball at biggest. Can anyone suggest a name ?

[woofgang]

Bellis perennis, the Rob Roy Daisy
http://www.google.co....UoAQ&biw=1024&bih=672

[hammerman]

Knautia ?